To protect your photos from copyright infringement, you should register your photos with the US Copyright Office. This will provide you with independent, legally permissible proof that you own the copyright on your work, making it easier to navigate intellectual property lawsuits. You can register your photographs online by completing an application form on the Copyright.gov website. Additionally, you can protect your digital images by putting a textual or semi-transparent watermark on the image itself. This can be anything from your website's logo to your signature or website address. Semi-transparent watermarks are more effective than textual ones as they are much harder to remove.